CN108559820A - The method that laser surface hardening based on generation gear grinding avoids tempering band - Google Patents
The method that laser surface hardening based on generation gear grinding avoids tempering band Download PDFInfo
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- CN108559820A CN108559820A CN201810352252.9A CN201810352252A CN108559820A CN 108559820 A CN108559820 A CN 108559820A CN 201810352252 A CN201810352252 A CN 201810352252A CN 108559820 A CN108559820 A CN 108559820A
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- Prior art keywords
- gear
- laser
- tooth
- flank
- quenching
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention relates to one kind being directed to gear surface laser-quenching method, avoids the tempering band generated between hot spot.The present invention is based on the generatings of gear, and steps are as follows：It is irradiated using single beam laser, laser beam is moved when processing the flank of tooth along Involute gear track, it is moved along tooth socket easement curve track when processing tooth root and makes laser beam always perpendicular to gear teeth face, the flank of tooth one by one is scanned with speed V, is continuously finished the quenching of entire gear teeth face.The present invention makes laser be moved along the track and easement curve track of Involute gear, and make laser beam always perpendicular to gear teeth face, it avoids due to being quenched respectively to flank of tooth tooth root and causes to reduce gear surface hardened layer hardness caused by the leading to the problem of of lap-joint's tempering band, to improve gear surface integral hardness, meet practical application request.
Description
Technical field
The present invention relates to laser surface modification, Surface heat-treatent field, specifically a kind of laser based on generation gear grinding
The method that surface hardening avoids tempering band.
Background technology
Gear is widely used part in machine industry.In order to improve the bearing capacity of gear, extends and use the longevity
Life needs to carry out Surface hardening treatment to gear.Laser transformation strengthening is to use Laser Beam Scanning Workpiece, and workpiece surface is made quickly to rise
More than temperature to AC3 critical points, by thermosphere when hot spot is removed, since the conduction of heat of workpiece substrate makes temperature moment enter horse
Martensitic traoformation or bainitic transformation occur for the areas Shi Ti or Bainite Region, complete phase transformation strengthening process.Laser has heating speed
The advantages that height, cooling velocity is fast, laser direction and controllable parameter.Therefore laser is used for the surface treatment of gear, be that gear is hard
Change the new way of processing.
However it is directed to gear teeth face laser quenching mode, since the shape of gear-profile is complex at present, swash
Light beam is difficult that the entire flank of tooth all hardens in single pass.Only laser beam scans one to the tooth top and tooth root of each flank of tooth
It is secondary, just the entire flank of tooth can be made all to harden.Since the overlap of twice sweep band is secondary quenching region, nearby will appear certain
The tempering of degree and form tempering band, and be tempered band once being formed, the hardness of gear surface part will be reduced so that the flank of tooth
Hardness of hardening is unevenly distributed, and influences product quality.In addition, such as the method using circumferentially continuous scanning（That is gear continuous rotation,
Hot spot moves axially, and spiral shape interval hardenability band is formed on the flank of tooth）, then can have several main problems：1）The shape on the flank of tooth
At the narrow refined zone between hardenability band, the hardness for being tempered band is lower 10HRC or so than the hardness of hardenability band；2）Hot spot is from tooth root
During being moved to tooth top, power density gradually increases, if laser parameter and scanning motion parameter selection are improper, tooth top
Part is easy scorification, and the modulus of gear is bigger, and such case is more notable；3）Using the best strengthening point of circumferentially continuous scanning
It is difficult to control on the position for needing most reinforcing.It novel avoids generating when being directed to gear surface laser quenching so exploitation is a kind of
The method of tempering band has great importance to the laser surface hardening of gear teeth face and the raising of gear surface quality.
Invention content
In order in gear surface avoid the generation of tempering band when laser quenching, the present invention provides one kind passing through change
The scan mode of hot spot and laser beam, so as to avoid the production for causing lap-joint to be tempered band due to being quenched respectively to flank of tooth tooth root
The method of the laser scanning and quenching based on generation gear grinding for the problem of gear surface hardened layer hardness is reduced caused by life.
Technical scheme of the present invention：A method of the laser surface hardening based on generation gear grinding avoids tempering band, step
It is rapid as follows：It is irradiated using single beam laser, laser beam is moved when processing the flank of tooth along Involute gear track, when processing tooth root
It is moved along tooth socket easement curve track and makes laser beam always perpendicular to gear teeth face, the flank of tooth one by one is scanned with speed V, continuously
Complete the quenching of entire gear teeth face.
Preferably, it is gear teeth face width W that the light spot shape of laser beam, which should use strip shaped laser spot, spot length,.
The laser surface hardening method for being preferably based on generation gear grinding is uninterruptedly once to complete entire gear
The process for quenching on surface makes to harden so as to avoid the tempering band that overlapping regions when respectively quenching the flank of tooth and tooth root is formed
Layer can be uniformly distributed along gear surface well.
Preferably, this method is suitable for the laser quenching of gear, spline teeth surface.
The present invention is based on the generatings in gear gear cutting consideration, using single track laser beam vertical irradiation gear teeth face, simultaneously
Using strip shaped laser spot（Spot length is equal to the width of gear teeth face）, the flank of tooth is along Involute gear molded line scanning motion, tooth
Root is along tooth socket easement curve molded line scanning motion, and the continuously flank of tooth tooth root of heat gear, primary incessantly to complete one by one
The laser quenching of gear, so as to avoid the tempering band for quenching and generating twice to the tooth root flank of tooth respectively.
The present invention has following features：
1. the present invention relates to the basic principles that Gear Processing and metal material are heat-treated.According to common in gear working method
Generating is avoided by changing the scan mode of laser beam due to flank of tooth tooth root point in conjunction with the technology of laser surface hardening
It does not quench and causes to reduce gear surface hardened layer hardness caused by lap-joint's tempering the leading to the problem of of band；
2. using large area hot spot, increasing heating surface area and ensureing to be heated evenly so that tooth root flank of tooth primary heating completes quenching,
It improves work efficiency.
Description of the drawings
Fig. 1 and Fig. 2 is that the present invention is based on the laser beam irradiates schematic diagrams of generation gear grinding；
Fig. 3 is the laser beam direction of motion, that is, Involute gear track AK；
In figure：W is the beam width of generating irradiation.
Specific implementation mode
The present invention will be described in detail below in conjunction with the accompanying drawings, but is not limiting the scope of the invention.
As shown in Figure 1, Figure 2, Figure 3 shows, the present invention is a kind of method for the laser surface hardening being based primarily upon generation gear grinding,
Specific implementation method is as follows：
1. cleaning gear surface, degreasing is removed；
2. single beam laser beam is used to irradiate gear surface with direction shown in FIG. 1, the strip light of W width as shown in Figure 2 is formed
Spot is programmed by manipulator so that laser beam is scanned along the direction of Involute gear with certain speed v（In Fig. 3
Shown in AK lines）, and keep laser beam vertical with gear teeth face holding, once complete the quenching of entire gear surface；
3. completing the hardness of detection gear surface and the depth of laser quenching hardened layer after laser quenching.
To sum up, the present invention is a kind of method carrying out laser surface hardening for gear surface, passes through generation gear grinding
Mode carries out laser scanning, so as to avoid because being tempered band caused by secondary quenching, to improve gear surface quality, contracts
When casual labourer.
Claims (4)
1. a kind of method that laser surface hardening based on generation gear grinding avoids tempering band, it is characterised in that：Its step are as follows：
It is irradiated using single beam laser, laser beam is moved when processing the flank of tooth along Involute gear track, when processing tooth root along tooth
Slot easement curve track moves and makes laser beam always perpendicular to gear teeth face, scans the flank of tooth one by one with speed V, is continuously finished whole
The quenching of a gear teeth face.
2. the method that the laser surface hardening according to claim 1 based on generation gear grinding avoids tempering band, feature
It is：It is gear teeth face width W that the light spot shape of laser beam, which should use strip shaped laser spot, spot length,.
3. the method that the laser surface hardening according to claim 1 based on generation gear grinding avoids tempering band, feature
It is：Laser surface hardening method based on generation gear grinding is uninterruptedly once to complete the quenching of entire gear surface
Method keeps quench-hardened case fine so as to avoid the tempering band that overlapping regions when being quenched respectively to the flank of tooth and tooth root is formed
Ground is uniformly distributed along gear surface.
4. the laser surface hardening based on generation gear grinding according to any one of claim 1-3 avoids tempering band
Method, it is characterised in that：This method is suitable for the laser quenching of gear, spline teeth surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810352252.9A CN108559820A (en) | 2018-04-19 | 2018-04-19 | The method that laser surface hardening based on generation gear grinding avoids tempering band |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810352252.9A CN108559820A (en) | 2018-04-19 | 2018-04-19 | The method that laser surface hardening based on generation gear grinding avoids tempering band |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108559820A true CN108559820A (en) | 2018-09-21 |
Family
ID=63535715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810352252.9A Pending CN108559820A (en) | 2018-04-19 | 2018-04-19 | The method that laser surface hardening based on generation gear grinding avoids tempering band |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109694943A (en) * | 2019-02-12 | 2019-04-30 | 上海理工大学 | A kind of composite surface treatment method strengthened for gear surface |
| CN112695157A (en) * | 2020-12-02 | 2021-04-23 | 西安必盛激光科技有限公司 | Gear laser quenching method and device capable of obtaining continuous uniform hardened layer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0147190A1 (en) * | 1983-12-21 | 1985-07-03 | The Garrett Corporation | Method and apparatus for laser gear hardening |
| US5164957A (en) * | 1991-08-20 | 1992-11-17 | Westinghouse Electric Corp. | Energy beam director apparatus |
| CN1394969A (en) * | 2002-07-22 | 2003-02-05 | 广州富通光科技术有限公司 | Laser surface hardening process of gear |
| CN201129429Y (en) * | 2007-08-17 | 2008-10-08 | 中国第一汽车集团公司 | Gear ring tooth surface laser hardening model |
-
2018
- 2018-04-19 CN CN201810352252.9A patent/CN108559820A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0147190A1 (en) * | 1983-12-21 | 1985-07-03 | The Garrett Corporation | Method and apparatus for laser gear hardening |
| US5164957A (en) * | 1991-08-20 | 1992-11-17 | Westinghouse Electric Corp. | Energy beam director apparatus |
| CN1394969A (en) * | 2002-07-22 | 2003-02-05 | 广州富通光科技术有限公司 | Laser surface hardening process of gear |
| CN201129429Y (en) * | 2007-08-17 | 2008-10-08 | 中国第一汽车集团公司 | Gear ring tooth surface laser hardening model |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109694943A (en) * | 2019-02-12 | 2019-04-30 | 上海理工大学 | A kind of composite surface treatment method strengthened for gear surface |
| CN112695157A (en) * | 2020-12-02 | 2021-04-23 | 西安必盛激光科技有限公司 | Gear laser quenching method and device capable of obtaining continuous uniform hardened layer |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180921 |
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| RJ01 | Rejection of invention patent application after publication |